View Full Version : Emissions Problems (results)

uber e36
04-29-2006, 07:53 PM

I failed my emissions today. The results are below:

At Idle
Reading Allowed Result
HC ppm 196 200 pass
CO % 0.04 1.00 pass
NO ppm n/a n/a n/a

At 40km/h
Reading Allowed Result
HC ppm 144 58 FAIL
CO % 0.57 0.32 FAIL
NO ppm 547 435 FAIL

Now the weird part...

Last week I tested and only failed the HC ppm (200). They said that was because I had just unstored the car. So I drove for a week and the number did decrease, but is still way above the limit.

But my CO % and NO ppm were fine last week!

The changes I have made since then are:
- Installed genie headers, high flow cats and a brullen exhaust.
- Changed my oil & filter.

So the questions I have are:
1. How can I lower my HC ppm? I understand this is unburnt gas. I've bought new spark plugs to install - will this help?
2. What have my CO % and NO ppm gone up? What do these measure? How can I fix?

Thanks guys!

04-29-2006, 09:54 PM
o2 sensor seems wonky.. Try to replace.

04-30-2006, 12:30 AM
o2 sensor seems wonky.. Try to replace.Good advise! When I had my E36 last year I failed badly aswell. I had my o2 sensor changed and passed with flying colours the next day.

04-30-2006, 12:54 AM
Since we are on topic, I have a question
If you fail emission, does it go somewhere in your car history, like carfax? I think I've seen it somewhere.

04-30-2006, 02:25 AM
Drive the car hard before you take it in. Make sure the cats are really hot so they actually burn up the unburnt fuel.

And I also agree with the spark plug and O2 comments.

04-30-2006, 02:56 AM
Your CEL on? you put that gas line cleaner "guaranteed to pass" in? that stuff works wonders.

btw you have PM

04-30-2006, 02:59 AM
Fuel stabiliser works great too *th-up*

uber e36
04-30-2006, 09:36 AM
Thanks guys!

I had fuel stabiliser in the first time (because it was in the tank from winter storage).

I did drive it really hard before I took it in...

I think I'll change my plugs and O2 sensor and try again!

What is CO % and NO ppm? And what can usually cause them to be high?

04-30-2006, 11:14 AM
I've seen a few car have problems with highflow cats installed.....I think you should have waited until after you passed emissions to install that stuff.

Its too late now, but i think if you had driven it for the week without changing anything you would have passed.